Cooler



FIG. 1 is an upper perspective view of a cooler;

FIG. 2 is a front perspective view of the cooler;

FIG. 3 is a top view of the cooler; and,

FIG. 4 is a bottom view of the cooler.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a cooler, as shown and described. 